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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039c662b4347378d5cd191a020c4d1aa2476b985597215757eb3dfe85e188abf' 
  AND token = 'u5+aUpAwxI2VHv6EwtpUUfj5+QV+0bj5K44hnjNSdMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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