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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f96e04dbb6e49a41bdd9e7fd7d5cafec672fedced56edcf26b3b5132b8b9d40' 
  AND token = '6G5t/JR0qKwbyxzxYsj/+WeB/hvvtiwJc60pW/jpzac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}