SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb04cbd800af9b3d1e96090f0b814fb99f486283d0b4d91a27363de9a9b37e8' 
  AND token = 'eDXCF1vk0tZBOX//qdGYsCfxWyzuMgVgY16vDvnlIR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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