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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8fa34c1d9fe5050e10cf205835a3e737bfe17f479e2acb1db93355479dd95e0' 
  AND token = 'nvT42jMij9J51zOMuyqgphSo4avvvmEffVYSkDy5zPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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