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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa8c7946b64b7a6c230982c24a3a46442232665faa14c2cea22fd601b3f30d5' 
  AND token = 'c0tKhk2r9mTPZIVS8AE0aMFyRedm7BJy898CSRSZcVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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