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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d7227b4a64c8c60c1f15adcadbaa6b7ce2fc1f5b3a539e4193b565f8758d42' 
  AND token = 'kZpowWIeu9YNNp8VnPfcGqu08Bw3uKtEai+0rRwEfDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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