Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da5376dfc2b0e576fdebc1d6d8b940d544175a37433f77f74a07499a2371d1a' 
  AND token = 'EoEqyVF9UUsOB5fipEZkvQuuEhu/+CeNWZr/q3lzA80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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