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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd394170fd6da27ee3f9459237b3aa9873a38257be3cc293d792adde399e4578f' 
  AND token = 'PYtQjDt3d1OEp1809Pw7LJoeOyAGdSNSuXe//8KgoXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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