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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59c2b23a65433d95b2ed88a6a218c0b4e9cdf97a43e19eb9b96ed007bd640241' 
  AND token = 'pusO+LSqQswFM/rgIg56sLAYxU8HOveT9rkRRqwnJfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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