Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a6d6647ff5e3e42fbad1fabf7a46681486a67b3f271d329bc5b364fda33bbd' 
  AND token = 'H3cf6kbwmTOJw3NvwKysrRsYTYFq6DE+oN+csy5hzzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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