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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de57174edd8649662a57464350a8405b5ebd972897121e9920e8252ccd4f3710' 
  AND token = 'vCc0CANYG09oA7bLPoRq2Yr1pm71mO9nBzPnOrvJzjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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