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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf52d65cf19e905b6cb4676328f3b488f7440f59b4a52e3a3d516c75f9aa8852' 
  AND token = '3DyBQ192s8WrCgxwHeeWXcj+D1NdTA4OSlfT61yTUoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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