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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec4f2da7cf9c6e7b451f4fad5250d50e26e2ed009ee2a9375dc033acb26eace' 
  AND token = 'Kz+G6qHiV0+8nykNE/By6gCnDOIUOBiFd5HonbtBK3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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