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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd161094e370a33d91522cd0c5940fe7cf05c9c5cdcb24b540c314fe38cb8ba15' 
  AND token = '07ANxJql21aa512Tqxe04YYdAlY2LIicw1qIw2mzs/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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