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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e97c736fa6346ca0d4e374fa7d6228d48e1ab33cca63354007be6a408244e8' 
  AND token = 'SykKsrsnde/eDay4YDfM8eB8Vwr15+gx5hezTx1mATI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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