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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb02886e3d269a1a88b382e65b9d01a619251234a1f736699dd6af029b76d0f' 
  AND token = '/wwoGUiuGTMR2tPstW+LC79zpq3j0/h1Uef/2khOPIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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