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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56527eda559f36a31a2b80040688a21cc39a42fe796059aa31f40e63904faf29' 
  AND token = 'UwUHOz/Qj77NQii+KZJFKVgnzk3WOma4jOQ6Zmr3l9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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