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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23b5a2c4f02c9018b2c632570037778c6658b864a19fd4e483b74fdca06555a' 
  AND token = 'oVZmRA2L/1/uZFHrX/hjdbJsO1Q36N6cUmXJNZbvISI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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