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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9d060a2c09ecacb027b4df62184b3a4f047b8b7fb70f60e9103d3df5608ccb' 
  AND token = 'xFdJUumLtQHaYnPYUTzRkcqpIaH5EiDOuPsviS3B/gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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