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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8fcd9e99f3993555ac37eabceb44e15f1c769e13d27b7dfdd7c1c864859aa3' 
  AND token = 'xhxp7jVIj7b2CNmceD2O3j483AmqKl9jxnNnZce/z+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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