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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7d8eda293c4b770e3c0076058ddd30c2e017b9a6acc6e1d5bd2b9bc7aa115d' 
  AND token = 'ylA2qfx+pmVzhiFPwyqRmAJyxcWQGjyNYS4kYvYvwk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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