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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95e352c2092400fbbdfba09e453f19d26f57fe1242f3a39e8a6c0a9520f0b9e' 
  AND token = '5j57WkU+UGDstn6sRyppaoW9qdYX8zgeiWcC7jQaApU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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