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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8750e27c49892d6ad767eb3cae5022bfbd7197be1de6c2a19b5f44359113e1' 
  AND token = 'Lau+S9Nm6UflE+/W1S7eAcuox6pA/xnX6JB1SoCVwIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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