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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8de9cb1539b8783c99c4cb19783c3d27a55f350cb6ac4358cd8d3aa01d9e54d' 
  AND token = 'xoEynpaFEJXdUiSNq1WeiwYqc8vJlLlAzzddltMoJlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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