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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a657ef193e94b60c36de1c63c4818ee5df56fd5737c6c2fe05822d8564248d' 
  AND token = 'lInYT1lDVj6nkpFZCgTV3Y8n6BRxPr5UJ2Z8i04T56Y=' 
  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"
    }
  }
}