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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494f60c6bced711ad090db5153960c3b00efe84ee2ed4e6c9771d33d21f636d0' 
  AND token = 'vEgTK+eNfmHLP/A6QYR5JZQXhtNR5YomQcN7e+eeMnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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