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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c38c1638f8f902efd28d23b4b165b7a5d610c6c649ca18ceaf66d88b109ed0' 
  AND token = '4oKMrX5N0KPwFLa+xd7Y+Y/nemJzpttwjna+0UJzu58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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