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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c7b6cf1b65e3662aac15958e8528edd5e7a86dc54c066677050d4a73c9efd4' 
  AND token = 'IUIsqAn18K+DkXBO0jE54oqZysXZVLwy5aUGVz9Bhm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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