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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2cd18f12b13e5edcd23b455a491b82348b925dd7e6141958dcc176bdc66d95' 
  AND token = 's/u57xBA3rsUdKoKgRDf5XQrHW/dmMbqhbK2USTVf8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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