SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7582add8b06877acf1a79f749469599f6ec7b1a3573f9e6d411ce9db76f145bc' 
  AND token = 'Hzh33+NDDZKGTtSUNjxndVbHDYTY1avOfpbUKwa53uk=' 
  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"
    }
  }
}