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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6b3599c0e4298ce8ebe3dc157fb8f18481bf4fc37963c6f9c95fbd8355569e' 
  AND token = 'pSsAWYSoO0nWi7/87luqzjVcNbIhNJayGm3GrQlu5yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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