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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05be672f61d29548bebc520169c0f7d9ecc58f7dc8791437c029f6daf7e12442' 
  AND token = 'JbcIUOZmJKHQbniHfY4j0kPnxfYK2m5sda2NT7CMQ8Y=' 
  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"
    }
  }
}