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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1378ccd3deb7744e5b14414906a8870daf327a755bf6dff4f073851652de8ca' 
  AND token = 'xbTgyFmecGIq87w374w33BvRV2chnB2cu2nBlqhds7A=' 
  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"
    }
  }
}