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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee04a6dc0eb6779b3cbf77afde40847f91d69f081862f8447283fd3419c1caee' 
  AND token = 'c+xqHznNv0VkYJ5pkhOdLauHdu7Q5/eA+HgDnhvzffk=' 
  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"
    }
  }
}