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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb044cf231463276083bc928ec6a4c574cc5c4a7a46ac35c1bcf358faf43eb3' 
  AND token = 'CasFE72YliQU9Fj+B8Db3r/9qtQB7sP5Yw4rEvh6VeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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