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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57625f663ee33a855f6d1a071c1b69d2ad9b7270f6988d1ae54c56f4ac2f6da2' 
  AND token = 'Lt8wNeNvKgioQxFXgrCUIdwRVYn2EMMulO8sUvVvpjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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