SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd581e7ba776bcfa9ff78881b76d7e6c13a0a58cb8a42e4651c1ebf4409d3991' 
  AND token = 'X/YZYZfGbcol6cquBU15E/WczTYGgDHoK7SWgPjowCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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