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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd663fa0768f0444324de4ddb471c54d80dc1e28e61c421babb57ed2e0f4a08cc' 
  AND token = 'h3TpyIay6hqy5ZaOIPdfeFGZcJDSv5ogfwG+c/dRwZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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