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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8062a87a809fda90466cc76934143a50df39a95c3bffc2dba95f7dc7dece2d' 
  AND token = 'D6twpRWqlm6nv2Q/v+abgUeagOUWlGnUYk+ECbnMXaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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