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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7f870838465cf2642a600ffd60a59800e33efc9ddeb636ab73729bf55a280f' 
  AND token = 'A69akZl7VMdN+mHBCELSA0cjet2RBTjYw/cjRrH0K1w=' 
  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"
    }
  }
}