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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89888cef22a62618eebcbcd6b877d149c02df4877295ca9df422dd4c0b4759c5' 
  AND token = 'zikBx1JlNX55sgwA3KTZFF5J1sJgtwfKbDSR54UaoGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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