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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d444d5c9c21ca4b882f69fef13a1d6c443d52f61fe9e6d20c8d3cb9e521e0fc' 
  AND token = 'mR5mESRLW10QTcDgppLWyTZ150a+IAdauDCRcxMfxWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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