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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36baa2c86a5c5e0e3174692b26a29ab56afab9a9b4b197cd3e36f1cdaa660c03' 
  AND token = '9inBsg0lsjIBzjooVlZbKOQVkRsOCX0Zu36S/Ub7+sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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