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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e9c22a885a76647835229716955871e830dcd8cf928c93c7c740ee80590640' 
  AND token = 'GUsDVUUWSh2IdO71MRwqtvIgT5M+c23ghSimTUwW0Sw=' 
  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"
    }
  }
}