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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '607d81f16e1ab67e4ce8007fc5a47e58c4d03e5bb7efa65b85a859312b1056be' 
  AND token = 'U7GbQMp3NUdNfodkeX9dSu+viijgCh2kp/GuNld1AU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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