SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608791045feb6e902702d30cc593b31ca6a1d59621142c34b58529c81f46b930' 
  AND token = '+WRuvqhFJHh6F+NSDeX5V6ax+GpZYhLamvoihIp3cok=' 
  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"
    }
  }
}