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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '111b0384c7c66b96eab04b64459304fb5bb6c5a5c8ff99bcb3ad65b4f73a6d1f' 
  AND token = 'UOBL+9T06N8G7kqzsRx5bYzWW5CcRTYoMMoakmQPddI=' 
  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"
    }
  }
}