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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4757cdbec7226c6171afd454d6b5ef9742ac9b816b3dc4a96d11acf1d22b898e' 
  AND token = 'J5gJPTmG1EmwnIo0t+Q7AVTa2hz/7INriPS2sLdipg8=' 
  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"
    }
  }
}