Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0355f3d5cd1d9812839bfdd116025a5a5d28736811a1a62bcbebed468ac2086f' 
  AND token = 'PPlrOUgrR9wxR+EWJ5enY1Gp4NqYpooAk+7aJcH+6T4=' 
  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"
    }
  }
}