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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15deed06e3531234cb0d4aab0be604166f37548d4a5a515a4a7292b7ff313266' 
  AND token = 'iHcbE7iEvv3c3TR+aZsX8D4Ov2K7wyiCEaU7X6TJsB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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