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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a4f36db328e4836c0eb11a26a52fb733c72ca6247dcb7646cf423a93a98613' 
  AND token = 'SGyW4e276GWOx9Eylh2bWN123iD8cIhl2wD6wJwnQ28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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