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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95d862768062a019141b047f92b2e1589cbc7b2a6803d7720970826e3862ec0' 
  AND token = 'F3SmJKm27O3bZsn9SV4n9w+Enh2boGD+Gxy0S5d8b0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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