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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69be3bfb45ce3973e78876da0852dcb86e689701ccb53b1c5ae0c838e6f2e73' 
  AND token = 'XdNLXT12Mn4pPAf/qsJNvoPz1RonDfEEQo0F6k7fhRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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