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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa2a5cf8c7c36873cc16b487eb8b9344cd60e529305984eb4e9158c248300f0' 
  AND token = 'up5pic81x5mE5/Qiwn3j8wQq17DHL8WY0HQYOE182GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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