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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb9528aafc9c057303294e0151cd9c87c12b4d75dc144b39a82f789ee6953c1' 
  AND token = '3WAOB9jRLQBhLA7xj+0GZlKM9YfCJJ2sAJIeCos2OKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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