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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab39dff4864881e25f4fc5f2e4cf0d2e440f18661ba02e77ca7ccdb86c044709' 
  AND token = 'pV3Ddau/RIRjgpvkB/ytT0/9C5YwbK/EoCUvMGFwSM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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