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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63493ef0e6652b74ae2f33aecb3be475717e6348b489bd77108b6433051f8956' 
  AND token = '+qooaQps94sZ4l5rEyoEXVOPcIW4E30T658wCdc3pck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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