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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f9c0dc8b13e20eec4533f5d2ad96f11dc2d199cbafb17ba9477be87cf1dfdd2' 
  AND token = 'ypIhJKaRlWLMHMe2DFbZ1Rvxq/2OsFa70TYy77pkzfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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