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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241242f93eaca6f42867280b2a167248e495d32e6d3d29a359ed4ee3ca66fb60' 
  AND token = 'VS2Kt7VPrY123LRCMf8J5x70MeDtvcSRIM9eyHR2ZB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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