SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6729dfb60f5f4de688b59ec895843a44c4d6255b57b832cdbdb931c8c6701b7' 
  AND token = 'GzX12BE1g7JWgZv4BSpGiPgpQCGA0xplL2l44xTiL/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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