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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d4f1799eb98f95680b38fc601964c2e1f853691809356e8df4f7b518b52fe49' 
  AND token = 'sPNI6I4Rq/E12c2lvrODSdvaWUyf69ZMsc9YG0dUzr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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