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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6180dd98b97795f30aca2f58f1fc26fb5fe304a416c1c3dc875a9830eaf5f98' 
  AND token = 'u6gnt9iODdRDJK9M8RvnWg3qShJft03PestVoTW982U=' 
  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"
    }
  }
}